The Nastiest Ongoing Celebrity Feuds

Can't we all just get along? We're breaking down the latest round of celebrity feuds and explaining why stars love to lash out on Twitter.

After Larry King called Piers Morgan "pompous" during an interview, Piers fired back on Twitter, calling Larry "a graceless old toad."

Brandi Glanville and LeAnn Rimes have been duking it out since 2011. Brandi has been able to parlay her battles into big business. Her Twitter feud has spawned two books for The Real Housewife of Beverly Hills.

While the feuds are different, there is one constant: they have all been at least partially fought on Twitter. Cooper Lawrence, psychologist and author of The Cult of Celebrity explained why we're seeing more of these battles fought online.

"If you're being interviewed by somebody, you're not as likely to say how you really feel, there's publicists sitting there," said Cooper. "But when you're home alone in front of your computer, you feel more comfortable."